Don't update AgentCache when Chassis_Private.chassis == []
When we delete a Chassis object when deleting an agent, the corresponding value in Chassis_Private.chassis is automatically set to []. Even though we use frozen rows, since we listen for updates to Chassis_Private, we will replace the row in the AgentCache with this new "chassis-less" entry, which will break things since Chassis_Private.chassis is used to display information which is only stored there like 'hostname'. This patch avoids updating the AgentCache when Chassis_Private has an empty Chassis field. Related-Bug: #1914757 Change-Id: Iad01db7f33d6c61b29c552d2dc8893e2946a369a
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@ -265,7 +265,12 @@ class ChassisAgentWriteEvent(ChassisAgentEvent):
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events = (BaseEvent.ROW_CREATE, BaseEvent.ROW_UPDATE)
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def match_fn(self, event, row, old=None):
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return event == self.ROW_CREATE or getattr(old, 'nb_cfg', False)
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# On updates to Chassis_Private because the Chassis has been deleted,
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# don't update the AgentCache. We use chassis_private.chassis to return
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# data about the agent.
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return event == self.ROW_CREATE or (
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getattr(old, 'nb_cfg', False) and not
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(self.table == 'Chassis_Private' and not row.chassis))
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def run(self, event, row, old):
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n_agent.AgentCache().update(ovn_const.OVN_CONTROLLER_AGENT, row,
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@ -291,6 +296,11 @@ class ChassisMetadataAgentWriteEvent(ChassisAgentEvent):
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if event == self.ROW_CREATE:
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return True
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try:
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# On updates to Chassis_Private because the Chassis has been
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# deleted, don't update the AgentCache. We use
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# chassis_private.chassis to return data about the agent.
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if self.table == 'Chassis_Private' and not row.chassis:
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return False
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return self._metadata_nb_cfg(row) != self._metadata_nb_cfg(old)
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except (AttributeError, KeyError):
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return False
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